This chapter suggests that metaphor research can benefit from a clearer description of the field of research. Three dimensions of doing metaphor research are distinguished: metaphor can be studied as part of grammar or usage, it can be studied as part of language or thought, and it can be studied as part of sign systems or behavior. When these three dimensions are crossed, eight distinct areas of research emerge that have their own assumptions about metaphorical meaning, which have their own implications and consequences for the aims and evaluation of research. It is suggested that these distinctions will help in clarifying the validity of claims about the role of conceptual metaphor in language.